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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Jun. 30, 2015
Income Tax Disclosure [Abstract]          
Possible decrease in tax expense in next 12 months $ 3.8   $ 3.8    
Taxes paid on cash distribution $ 13.6   $ 13.6   $ 12.1
Effective income tax rate 7.20% (1.20%) 9.40% 17.60%  
Increase (decrease) of income tax expense $ 5.7   $ (14.8)    
Increase in tax expense due to higher next income 12.8        
Decrease in unrecognized tax benefits with related interest and penalties     $ 14.5    
Impact of foreign tax rates (4.4)        
Amount of tax filings in excess of amounts booked $ (3.4)